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Author: search.filters.author.Belgamwar, Sachin U.Subject: search.filters.subject.Heat transfer enhancement

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    Experimental investigation of pool boiling heat transfer on CU─AI2O3 composite coated patterned surfaces using refrigerant R-134A
    (Wiley, 2024-11) Belgamwar, Sachin U.
    The present study investigates pool boiling heat transfer (PBHT) of R-134a on Cu─Al2O3 composite-coated patterned surfaces (CPSI, CPSII, CPSIII, and CPSIV). Using a wire EDM method, four different types of copper patterned surfaces (PSI, PSII, PSIII, and PSIV) were manufactured. Comparing the heat transfer coefficients (HTCs) of the Cu─Al2O3 composite-coated patterned surfaces to the uncoated Cu surfaces, a notable enhancement was observed. The maximum HTC improvements of 162%, 178%, 189%, and 211% were observed for CPSI, CPSII, CPSIII, and CPSIV, respectively, when compared with bare Cu surfaces. These results demonstrate the effectiveness of these treatments in enhancing heat transfer compared to bare copper surfaces. The enhancement in PBHT is mainly due to the integration of porous Cu─Al2O3 composite coating with patterned surfaces which resulted in a larger heat transfer area, improved capillary action, and a substantial increase in active nucleation sites.
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    Pool boiling heat transfer enhancement on micro- and nano-structured copper surface
    (Springer, 2025-04) Belgamwar, Sachin U.
    As the power requirements of industrial and electronic equipment continue to increase, thermal management is becoming more and more important. BHT, or pool boiling heat transfer, is acknowledged as an effective technique for handling large heat loads. In this study, experimental work on pool BHT is conducted on a surface coated with porous Cu and R-141b. The porous coating is achieved using two-stage electrodeposition techniques on a plain Cu surface. Characterization results reveal that the copper coating consists of a combination of nano- and microporous structures. Experimental studies have shown that the presence of a Cu-coated surface significantly enhances the Heat Transfer Coefficient (HTC) by up to 53% compared to a surface coated only with Cu. Additionally, the Cu-coated surface reduces heat compared to the uncoated surface. These findings demonstrate that the porous Cu coating surface can effectively increase surface area, cavitation, and nucleation density, which are beneficial for heat transfer applications.